DE102016207655A1 - Fluid supply system - Google Patents

Abstract

The invention relates to a fluid supply system (1). According to the invention - a bypass valve (7) arranged in a control channel (6) with a valve body (8) which is adjustable between a first and a second position, - wherein the valve body (8) the control channel (6) in a first and a second space (10,11) separates and a leakage opening (12) which connects the first space (10) with the second space (11), - wherein in the second space (11) a spring element (13) is arranged, the the valve body (8) biases into its second position, - wherein the second space (11) via a leakage channel (14) with a fluid reservoir (9) is connected, - wherein in the leakage channel (14) a switchable valve (15) for at least Partial opening / closing of the leakage channel (14) is arranged, - wherein a detection device (16) and a control device (18) are provided which closes the valve (15) upon reaching a predefined property and thus the leakage channel (14) blocks.

Description

The present invention relates to a fluid supply system with a component according to the preamble of claim 1. The invention also relates to an internal combustion engine with at least one such fluid supply system.

From the DE 199 43 294 A1 is a generic fluid supply system of an internal combustion engine with a filter device and upstream of this filter device temperature-dependent switchable in the fluid circuit cooler known. At least a predominant volume flow flows through the radiator in a lower and an upper temperature range, while at most a non-predominant volumetric flow flows through the radiator in an average temperature range located therebetween. In this way, the temperature of the fluid should be able to be optimally adapted to operating conditions of the internal combustion engine.

From the DE 199 02 408 A1 an automatic transmission for vehicles with a hydrodynamic converter is known, which is supplied by a pressure oil pump via a main pressure valve with oil, a converter safety valve limits the oil pressure in front of the converter and branches off from the oil supply line of the converter, a lubricating oil line containing a lubricating valve and wherein also a Oil cooler is provided. This oil cooler is arranged in an oil line between the main pressure valve and the branch of the lubricating oil line and has a bypass whose flow is controlled or regulated.

Fluid supply systems in internal combustion engines, for example oil filter modules, are usually equipped with a cooler in order to protect the fluid, in particular the oil, from damage due to excessive temperatures during operation. In the cold state, however, the pressure loss of the cold fluid increases due to the changed flow properties, which is why usually provided with an expansion element bypass valve is provided which falls below or until reaching a predefined temperature a fluid flow past the radiator and only when reaching the predefined temperature the Fluid flow through the radiator, such as the oil cooler, conducts. As a result, adequate lubrication, for example, an internal combustion engine or bearings to be achieved even when cold.

As an alternative to the mentioned expansion elements also so-called bimetallic switches or FGL switches can be used, wherein all temperature-dependent bypass circuits due to the switch used, for example, the expansion elements, are relatively complex and expensive and also have a certain inertia, whereby a fast switching is impossible. In particular, bypass valves with so-called Wachsdehnstoffelementen, moreover, usually require at least a temperature difference of 10 Kelvin to reach the working stroke.

The present invention therefore deals with the problem of providing an improved fluid supply system with a bypass circuit, which is designed in particular structurally simple, inexpensive and fast switching.

This problem is solved according to the invention by the subject matter of independent claim 1. Advantageous embodiments are the subject of the dependent claims.

The present invention is based on the general idea to use for a bypass circuit instead of the expansion elements previously used for this purpose now a switchable valve, in particular a solenoid valve to use this but not directly to the circuit of a valve body of the bypass valve due to its relatively small stroke, but to open or closing a leakage channel, which influences the pressure conditions required for switching the valve body of the bypass valve. About the inventively provided valve thus no adjustment of the valve body itself, but only an influencing of the pressure conditions is effected, which lead to rapid adjustment of the valve body of the bypass valve. The fluid supply system according to the invention in this case has a component, for example a filter device for filtering the fluid or a cooler for cooling the fluid and a bypass channel bypassing this component. In a control channel, a bypass valve is arranged with a valve body which is adjustable at least between a first and a second position and which shuts off in the first position, a fluid flow to the component and in the second position, a fluid flow through the bypass channel, or vice versa. Of course, intermediate positions are also possible between the two positions in which a partial fluid flow to the component and a partial fluid flow flow through the bypass channel. The valve body of the bypass valve separates the control channel into a first and a second space and has a leakage opening which connects the first space with the second space. In the second space a spring element is arranged, which biases the valve body in its second position, wherein the second space is connected via a leakage channel with a fluid reservoir. In this leakage channel, the switchable valve according to the invention, in particular the solenoid valve is provided, by means of which the leakage channel can be opened or closed. Also provided is a detection device, a property, such as a temperature, of the fluid detected and transmitted to a control device, which in turn is designed such that it closes the valve when reaching a predefined temperature and thus blocks the leakage channel. Detecting device and control device can of course also be combined in an expansion element. With the fluid supply system according to the invention can thus be provided in a structurally simple and cost-effective manner, a fast-switching bypass valve whose switching movement depends solely on the spring force of the spring element, the position of the valve and the pressure of the fluid in the first and second space. Compared to an expansion element while the valve can switch comparatively quickly and thus quickly influence the pressure prevailing in the second space pressure ratios, which in turn due to the example prevailing between the first and the second space pressure difference and the spring force rapid switching of the valve body and thus the bypass valve possible are. Of great advantage here is that to lock the leakage channel an already very small valve lift of the valve is sufficient, which can be accomplished by such a valve, since the leakage channel has a very small cross-section compared to the control channel. Thus, a large cross section of the control channel can be switched via the valve body of the bypass valve via the comparatively small actuating movement of the valve or its valve body.

In an advantageous development of the solution according to the invention, the fluid supply system is designed as a lubricant supply system, in particular as an oil supply system. Due to the toughness of the oil in the cold state, a passage through the same by an oil cooler is absolutely to be avoided, which is why the bypass valve according to the invention can be used here in an advantageous manner in order to ensure fast and effective lubrication, for example of the internal combustion engine or other bearing points, both in cold as well as in a warm state.

In a further advantageous embodiment of the solution according to the invention, the detection device are designed as a temperature detection device and the control device such that it closes the valve on reaching the temperature of T ≥ 117 ° C. At a temperature of T ≤ 117 ° C, however, the valve remains open, whereby a leakage current flows to the fluid reservoir, in particular to the oil reservoir and by the pressure difference between the first and the second space in the control channel of the valve body of the bypass valve in its first position, against the spring force , is pressed. When the predefined temperature of 117 ° C. is reached, the valve closes off the leakage channel so that no fluid drainage into the fluid reservoir can take place over it. After shutting off the leakage channel, the pressure in the second chamber increases until it reaches the pressure in the first space, whereupon only the spring force of the spring element is responsible for the adjustment of the valve body. The two pressures in the first and second space cancel each other out in this case. Due to the spring force of the spring element, the valve body of the bypass valve is adjusted to its second position, in which the bypass passage to the bypass is closed and the fluid passage to the component is opened. In this state, the fluid flow is thus passed over the component.

In a further advantageous embodiment of the solution according to the invention, the valve body is designed as a valve piston, which has a shell-side first opening to the bypass channel and a shell-side second opening to the component. This represents only one possible embodiment of the valve body according to the invention, which, however, is comparatively simple and inexpensive to produce and at the same time enables comparatively simple pressure conditions in the first and second spaces. For this purpose, for example, the leakage opening in the bottom of the valve piston is arranged.

In an advantageous embodiment of the solution according to the invention, the valve piston or the valve body itself is formed of metal or plastic, with a metal training allows a particularly high resistance to aggressive fluids. In contrast, can be achieved by forming the valve piston / valve body made of plastic, a relatively inexpensive production.

In an advantageous development of the solution according to the invention, the valve has a solenoid valve, an electrical switch, a bimetal and / or an expansion element or is designed as such. Especially the embodiment as a solenoid valve, as a bimetal or as an electrical switch allows a comparatively fast switching and thus a quick reaction.

Suitably, the component may be formed as a radiator, transmission or filter device. Already this non-exhaustive enumeration gives an idea of the manifold possible uses for the fluid supply system according to the invention, in particular in an internal combustion engine.

Further important features and advantages of the invention emerge from the subclaims, from the drawings and from the associated description of the figures with reference to the drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Preferred embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.

Show, each schematically

1 a fluid supply system according to the invention with a fluid property below a predefined property,

2 a representation like in 1 but at a property of the fluid above the predefined property,

3 a fluid supply system according to the invention with a different valve and with a fluid property below a predefined property,

4 a representation like in 3 but at a property of the fluid above the predefined property.

According to the 1 to 4 has a fluid supply system according to the invention 1 , in particular an internal combustion engine 2 For example, a lubricant supply system and in particular an oil supply system 3 , a component 5 as well as an immediate bypass 4 on. The component 5 can be configured for example as a cooler, gear or filter device. According to the 1 to 4 are only the fluid channel 21 to the component 5 and the bypass channel 22 to the bypass 4 shown, so that the actual component 5 located below the displayed image plane. In a control channel 6 is a bypass valve 7 with a valve body 8th arranged between a first position (cf. 1 and 3 ) and a second position (cf. 2 and 4 ) is adjustable, and in the first position, the fluid channel 21 to the component 5 and in the second position the bypass channel 22 shuts off. The control channel 6 leads indirectly via a fluid pump, not shown, to a fluid reservoir 9 ,

Looking at the control channel 6 closer, so you can see that the valve body 8th the control channel 6 in a first room 10 and a second room 11 divided and at the same time a leakage opening 12 that has the first room 10 with the second room 11 combines. In the second room 11 is also a spring element 13 arranged, which is the valve body 8th in his according to the 2 and 4 biases shown second position. The second room 11 is also via a leakage channel 14 with the fluid reservoir 9 connected, wherein in the leakage channel 14 a valve 15 , in particular a solenoid valve, for at least partially opening / closing the leakage channel 14 is arranged. According to the 1 and 3 is the valve 15 shown in its open position, in which the second room 11 over the leakage channel 14 with the fluid reservoir 9 , which is depressurized, connected. In contrast, the show 2 and 4 the valve 15 in its closed position. In general, the valve can do this 15 a solenoid valve, an electrical switch, a bimetal and / or an expansion element 23 (see the 3 and 4 ) exhibit. Especially the embodiment as a solenoid valve, as a bimetal or as an electrical switch allows a comparatively fast switching and thus a quick reaction.

In addition, the fluid supply system according to the invention 1 according to the 1 and 2 a detection device 16 , For example, a temperature detection device with a temperature sensor, the / a property, in particular the temperature of the fluid 17 , For example, oil or lubricant detected and sent to a control device 18 transmitted, which in turn is designed such that it the valve 15 upon reaching a predefined property, for example a predefined temperature T, closes and thus the leakage channel 14 locks. For this purpose, the control device 18 of course also with the valve 15 connected.

According to the 3 and 4 are the detection device 16 and the controller 18 in the expansion element 23 integrated or formed by this, so that a separate detection device 16 and a separate controller 18 can be omitted, which leads to cost advantages.

In the 1 to 4 is the detection device 16 as a temperature detection device (expansion element 23 also detects the temperature) and consequently detects the temperature of the fluid 17 , The predefined temperature T may be, for example, 117 ° C, so that according to the 1 and 3 a state of the fluid supply system according to the invention 1 at a temperature T <117 ° C and according to the 2 and 4 at a temperature T ≥ 117 ° C is shown.

Looking at the valve body 8th closer, it can be seen that this is designed as a valve piston having a shell-side first opening 19 and a shell-side second opening 20 having, depending on the switching position of the valve body 8th the first opening 19 with the bypass channel 22 to the bypass 4 Aligns while the second opening 20 in the second position with the fluid channel 21 to the component 5 flees. The leakage opening 12 is in a bottom of the valve body 8th arranged. The valve piston itself may be formed, for example, of metal or of plastic, the formation of metal having a particularly high resistance to all fluids 17 offers, while a plastic version can be produced relatively inexpensively.

The fluid supply system according to the invention 1 works according to the 1 to 4 in a detection device designed as a temperature detection device 16 as follows:
At a temperature T <117 ° C, according to the 1 and 3 illustrated situation in which the temperature detecting device 16 (respectively the expansion element 23 in 3 ) detects the temperature, to the controller 18 then passes this and then the valve 15 keeps open. That in the control channel 6 incoming fluid 17 thus generates in the first room 10 a pressure P ₁ , passing it through the leakage opening 12 in the second room 11 can flow and over this and the open leakage channel 14 in the fluid reservoir 9 , The fluid reservoir 9 is usually depressurized, but with a valve body 8th' of the valve 15 For example, can be designed as a throttle, so that in the second room 11 does not adjust the ambient pressure, but only one with regard to the first room 10 prevailing pressure P ₁ reduced pressure P ₂ . Between the first room 10 and the second room 11 Thus, a pressure difference .DELTA.P, which is the spring force of the spring element 13 counteracts. The in the present case from below on the valve body 8th acting force F ₁ is measured to F ₁ = P ₁ · A _{(valve body)} - ΔP · A _{(valve body)} , whereas the top of the valve body 8th acting force F ₂ is measured as follows: F ₂ = ΔP · A _{(valve body)} + F _(spring) and where is true F ₁ > F ₂ .

As a result, the valve body shifts 8th up, until the first shell-side opening 19 with the leading to, for example, a filter device bypass channel 22 Aligns and the fluid 17 in the bypass 4 can flow. A small leakage current of the fluid 17 can also over the leakage opening 12 in the second room 11 and over the leakage channel 14 in the fluid reservoir 9 reach.

When the predefined temperature T of ≥ 117 ° C is reached, the bypass valve switches 7 in accordance with the 2 and 4 shown position, since upon reaching the predefined temperature T, the control device 18 a corresponding signal to the valve 15 transmitted and this then the valve body 8th' transferred to its closed position and the leakage channel 14 locks. Is the valve 15 designed as a solenoid valve or as an electrically switchable valve, so opening and closing takes place comparatively quickly, while in a valve 15 with an expansion element 23 a slower opening / closing takes place. In the latter case can do this on a separate detection device 16 and a likewise separate control device 18 and the associated wiring are omitted, since this in this case by the expansion element 23 be provided, which brings cost advantages.

Because of the leakage channel 14 in comparison to the control channel 6 has a significantly reduced cross-section, here can also have a only a small valve lift exhibiting but at the same time quickly switching valve 15 be used. After closing the valve 15 the pressure P ₂ in the second room increases 11 to the pressure P ₁ in the first room 10 , resulting in a ΔP of 0. In this case, there is thus no pressure-dependent adjustment of the valve body 8th of the bypass valve 7 more, because the bottom of the valve body 8th pressure-related force F _{1 of} the top of the valve body 8th exclusively pressure-related force F ₂ corresponds. Nevertheless, of course, the top of the valve body 8th acting force F ₂ greater than the force F ₁ , as from the top in addition to the force F _{(spring) of} the spring element 13 on the valve body 8th acts. It thus applies to the according to the 2 and 4 illustrated state: F ₂ > F ₁ with F ₂ = P ₂ .A _{(valve body)} + F _(spring) ; and F ₁ = P ₁ · A _{(valve body)}

With the bypass valve according to the invention 7 and the fluid supply system of the invention 1 is a control of the valve body 8th of the bypass valve 7 via the spring force F _(spring) via the fluid pressure P ₁ , P ₂ and via the position of the valve body 8th' of the valve 15 possible. Depending on whether the valve 15 is open or closed, can be a specific interpretation of the spring force F _{(spring) of} the spring element 13 the valve body 8th the bypass channel 22 to the bypass 4 open or close.

If the valve 15 is designed as a solenoid valve or electrically switchable valve, it can of course be configured such that it fulfills a so-called fail-safe function, that is, it must be energized to in accordance with the 1 and 3 be shown (opening) state to be transferred. Without power, the valve remains 15 in the closed state, leaving the fluid 17 or the oil always over the component 5 is routed and damage can be avoided.

The in the 1 to 4 shown predefined temperature T = 117 ° C is of course only one possible temperature, for example, for oil as a fluid 17 applies. Of course, other parameters can also serve as detection variable.

With the fluid supply system according to the invention 1 is thus a comparatively fast switching of the bypass valve 7 possible without the need for an actuator with a comparatively large valve lift would be required because the valve lift of the valve 15 for controlling the valve body 8th in the leakage channel 14 is completely sufficient to affect the pressure conditions P ₁ , P ₂ and thereby the bypass valve 7 to control. Will for the valve 15 used an electrically switching or a solenoid valve, so compared to wax expansion elements for controlling the bypass valve 7 a significantly faster reaction time of the bypass valve 7 be achieved. At the same time, this can be made more cost-effective and structurally simple.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 19943294 A1 [0002]
• DE 19902408 A1 [0003]

Claims (9)

Fluid supply system ( 1 ) with a component ( 5 ), characterized by - one in a control channel ( 6 ) arranged bypass valve ( 7 ) with a valve body ( 8th ) which is adjustable at least between a first and a second position and in the first position a fluid channel ( 21 ) to the component ( 5 ) and in the second position the component ( 5 ) bypass channel ( 22 ), - whereby the valve body ( 8th ) the control channel ( 6 ) into a first and a second room ( 10 . 11 ) and a leakage opening ( 12 ) having the first space ( 10 ) with the second room ( 11 ), - in the second room ( 11 ) a spring element ( 13 ) is arranged, which the valve body ( 8th ) in its second position, - wherein the second space ( 11 ) via a leakage channel ( 14 ) with a fluid reservoir ( 9 ), wherein in the leakage channel ( 14 ) a switchable valve ( 15 ) for at least partially opening / closing the leakage channel ( 14 ), wherein - at least one detection device ( 16 ), which is a property of the fluid ( 17 ) and to a control device ( 18 ), which in turn is designed to close the valve ( 15 ) closes upon reaching a predefined property and thus the leakage channel ( 14 ) locks. Fluid supply system according to claim 1, characterized in that the fluid supply system ( 1 ) as a lubricant supply system, in particular as an oil supply system ( 3 ), is trained. Fluid supply system according to claim 1 or 2, characterized in that the detection device ( 16 ) is designed as a temperature detection device and that the control device ( 18 ) is designed such that it the valve ( 15 ) when the temperature reaches T ≥ 117 ° C. Fluid supply system according to one of the preceding claims, characterized in that the valve body ( 8th ) is designed as a valve piston having a shell-side first opening ( 19 ) to the bypass channel ( 22 ) and a shell-side second opening ( 20 ) to the component ( 5 ) having. Fluid supply system according to claim 4, characterized in that the leakage opening ( 12 ) is arranged in a bottom of the valve piston. Fluid supply system according to one of the preceding claims, characterized in that the valve body ( 8th ) is formed of metal or plastic. Fluid supply system according to one of the preceding claims, characterized in that the valve ( 15 ) comprises a solenoid valve, an electrical switch, a bimetal and / or an expansion element. Fluid supply system according to one of the preceding claims, characterized in that the component ( 5 ) is designed as a cooler, transmission or filter device. Internal combustion engine ( 2 ) with a fluid supply system ( 1 ) according to any one of the preceding claims.

Images